Elevator lock



June l2, 1921?.

.,L-BAER D aLEvAToR Loox Filed .my 1'. 1921 Patented June 12,

JOHNBAER; or TRQNTOLQNTRIQ, CANADA,

ELnvAroR nocif'.

` l' application inea -Juiy 1 Locks, of which the` following-is a specification.

elevator locks as described in the present specification and shown inl-the accompanying drawings that form a part of the same: i' The invention consists essentially ofthe novel feature's'of construction wherebythe electrica-l circuit through the control mecha:- nismv is closed upon theclosing of the elevator door' andis' automatically opened upon the opening of said elevator door.

The objects ofthe invention are to eliminate all possibility of accidents due to movement of they elevator while theldoor is in its open or partly open condition, to'provide a form of lock whichmay bereadily installed on elevators already in use, and generally to provide a form of elevator lock which will be inexpensive of'construction, efficient in operation and durable. Y

In the drawings Figure 1 is a view of a portion of the elevator shaft showing a portion of the door and the breaker box.

Figure 2 is a vertical sectional view taken on the line A-A of Figure 1.

Figure 3 is a view of a portion of an elevay tor shaft showinga modified form of device adapted for use in cases where the Vdoors are of the swinging type. i

Figure 4 is a vertical sectional view taken on the line B-B of Figure 3.

Figure 5 is a detail.

Like numerals lof reference indicate corresponding parts in the various figures.'

Referring to the drawings 1 representsthe wall of the elevator shaft into which are fitted the door sections 2 and 3 as customary, the top section of said door being provided with a projecting finger 4.

5 is a casing rigidly mounted on the wall 1 adjacent to the door section 2 and constituting a container for the various parts ofthe circuit control mechanism to be ,Adescribed hereinafter, said box being provided with any convenient form of door.

6 is a locking bar o1 bolt horizontallyv mounted in bearings 7 and 8 in the walls of the box 5 and'beingheld normally to its' -"The invention relates to improvements in 1921. semaine. 481,894.

extended position in the path-,of the finger 4iby means ofl afhelicalnspring 9 encircling said bolt between a shoulder 10thereonand the wall of the box, said bolt"beingmanually withdrawable by .means of .a lever llpivoted to the outer end ofsaid boltand fulcrumed r in a bracket 12 projecting ,-outwardlyl from theboX 5. i

13y isa ,block constructed of any suit-able.

insulating materialand being rigidly ymounted on therear wall of the casing 5 beneath ymi the boltf6, saidblockbeing provided'with l vertical bores into each of lwhich is titteda metal bushing 14 adaptedV to s lidablyaccommodate al contact.plug.y 15. L I 16 are the electrical Vwires leading from' the controlgmechanism (said-mechanism not vbeing shown in thedra-wings as same may be of any well knowntype) and extendingl'into the bushing 14 respectively, the ends'okf, said wires and the top ends ofthe contact plugs y lcbeing spaced bysprings 17 disposed therelv between.;` c l 18 isa shaft rotatably mountedin bear,- ings 19 and 20 in thecasing 5 and havinga roller 21 rigid therewith, said roller being located just 'below the casing 5 andforming asupport for the Contact plugs 5 but preferably being ofset slightly .from said lugs,

said roller being constructed of insu ating4 material and havingl a comparativelynarrow strip 22 of current conducting material set therein and adapted upon the rotation of said roller to be engaged by said plugs for ,completing the circuit through the control mechanism. y y The bearing 20 is preferably a loose bear- "ing eXteriorly threaded `and adapted to be rigidly secured in the comparatively large opening through the boX by means of -a nut 23 screwing thereover and drawing, the

flanged outer end of the vbearing tightlyinto engagement with the wall of the casing, this construction being desirable to per- Vmit of inserting the shaft'and roller into the casing. v

24 is an arm endv of the. shaft 18 and outer end a roller 25.H i

j 26 is a metal strap mounted on 'a block 27 on the'lower section 'of the'door, said carrying at its strap being turned inwardly towards the` door at a comparatively sharp angle and in the meeting position of the door sections substantially engaging the topk section of the door, said strap or plate being adapted on rigidly mounted onl the outer i the upward movement of the lower section of the door to -deilect the roller 25 and the arm 24 outwardly thus rotating the roller 21 and bringing the inset 22 of conducting material into engagement with the contact plug 15 and thus completing the electrical circuit through the control mechanism upon the arrival of the door sections to their meetingpositions. Upon the receding of the strap 26 due to the separating of the door sections the arm 24 is allowed to drop to a vertical position rotating the roller 21 and disengaging the metal inset 22 from the plugs 15 and breaking the circuit through the control mechanism coincident with the opening of the door.

In Figures 3 and t a modiiied form of construction is shown for use in cases where doors ot' the swinging type are employed, under which circumstances a casing containing a block 10 containing bushings 14, contact plugs 15, wires 16 springs 17 and roller 21 having an operating arm 24 identical with the construction described above is located .above the respective door sections 2S and 29, each of said sections having a block 3() mounted thereon on which the roller from the corresponding arm 21 rests when the door section is closed, thus holding they metal inset 22 of the roller 21 in engagement with the plugs 15 and closing the circuit through the control mechanism when both door sections are closed. lVhen one orv other of the sections 28 or 29 are swung open away from the arm 24E said arm drops down to a vertical position and disengages the contact member 22 from the plugs 15 and opens through the control mechanism making it impossible to operate the elevator when either ot' the door sections are open.

`What l claim is In elevator locks for two members movable in relation to one another, an electric safety device and mechanical means for operating the same comprising a cam xedly secured to one member and formed with an inclined riding surface, an electric contact inserted lengthwise in an insulated block made in the form ot' a roller and journalled in the other member, an arm extending from said contact roller and carrying a roller at the end thereof riding on said inclined surface and a plurality ofelectrical contacts slidably supported and spring-held in contact with said contact roller and permanently connected t0 an electric operating circuit and forming a switch mechanism actuated to make or break the electric circuit on the movement of a member aforesaid.

Signed at the city of Toronto, this 17th day of June, 1921.

JOHN BAER.

WTitnesses:

W. G. HAMMOND, G. MURPHY. 

